﻿/* dk2Repository - Copyright (C) 2011 Daniel Kuczewski http://www.dk2.de/

 * This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

using System;
using System.Text;

namespace dk2Repository.QueryBuilder.SqLite
{
    internal class SqLiteUpdateBuilder : dk2Repository.QueryBuilder.UpdateBuilder
    {
        public SqLiteUpdateBuilder(dk2Repository.QueryBuilder.ISqlBuilder builder)
            : base(builder)
        {
        }

        public override string CreateSql()
        {
            if (ValueColumns.Length == 0)
                throw new Exception("UpdateBuilder must have at least 1 value");

            var sb = new StringBuilder();
            sb.Append("UPDATE ").Append(Table).Append(" SET ");

            foreach (var valueColumn in ValueColumns)
            {
                sb.Append(valueColumn.Column).Append("=").Append(string.IsNullOrEmpty(valueColumn.ParameterName) ? "?" : "@" + valueColumn.ParameterName).Append(",");
            }

            sb.Remove(sb.Length - 1, 1);
            sb.Append(" ");

            sb.Append(Where.CreateSql()).Append(";");

            return sb.ToString();
        }
    }
}